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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bda26d74343004590401dbd9fbddc06371965a380897a399ecd6c7a9664c853' 
  AND token = 'T8Gkjpvrggv31sEB9e90vjROiSeUqLZsrAlp6rVWb68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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