SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93682ed930d1cccf5b111be3073066d0fb2821189edc484217625eb4f988bd4c' 
  AND token = 'yUHMH4WzLYQhW4RVygxIYrEjPvUCuHo+sr0ZLJPbMhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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