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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a57557cdc71566b36a400edebf26a5ec3c57485ee5e3ecce117caf62a1f0856' 
  AND token = 'XGghrBxI8ekC51wMF5Fc2Ds+XUIl1mmzFCUuJxdxyO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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