SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3909f1931587f068765d143904bacaecb6c3a8d230c258d540ca0b7ea2081862' 
  AND token = 'wnWRshNO1g/yrhL/Sx1IZcSiYLQ8yj6SMy+Y/FjkFxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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