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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7adc0c4fa9d6ae8851ddf8843a57ead274b7f919bd8d21284de67f394f6be01a' 
  AND token = 'VJfIqTuNOPys7Jh6CqRm4b9dRxge5JyzlOeWqjnZkTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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