Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4165c86a5ed87a9e65c3d2e28fa1c5c4c8d78a303ce2e971ebb2beb228bb9674' 
  AND token = 'SMFgH3HLupYf00BLrobDRBDgEcq8SQF2D4TwKsBmYMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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