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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb787d11799798a3a24222a601e91f7f8494739bce5698c057f73d15ce9b7e21' 
  AND token = '0tiUMQmSTsVDRayT1gJqN1c54TGRQQTLd0ulxSLjDZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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