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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0627e435489ddbda85719dd1f068807e46efb5f3edf97cdb15a874bf65561802' 
  AND token = 'zmcsmrNOX5225y2kY5UI33BTUjN3I9J1P0YBFIg8sEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}