SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eb161be510878aa6a97b379573be75c4df11ca06c727fd555cff06bf4784ea7' 
  AND token = 'YSYmWrwTxCYSK6iRL4ZCIOsgZJ4G8hNNRgZlRWDwzdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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