SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c03cd11d4fb2d0ca56d5d1926dd120eb7fd4db35fecf95286b2c6ba8527d21e0' 
  AND token = 'eUwTVk3DCx0OvcDXgzSBh/j4fDY8JSkDU/PJZ6JyKv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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