SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a854427ff9770bce3200cfd813358062ae1c5524e459175c8649d8a9a2d79025' 
  AND token = 's8HS5uYbVzbHzIXmCRXfwuMNxtxWSJYgLF/tJ+Ga2XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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