SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f8aea3584072ac1d5d449fcc141994c7aa339e80e7ce3d8fb231b9920840fa5' 
  AND token = 'BhuwfYa/g0vauHT0U0tD4x+EMh/G5moZwwwbbmzCrDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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