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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c843ec41327c29f319f7481b5f05eb58e56fdaebf4bfa51120a9ae3c1bbb658' 
  AND token = '7sk0Awxek462Ku9qCN/xFnTbu4n+fteFzEiUY+ZsVmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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