SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '884dbd4d561ebdeaf9b36bc047c1a63459bbdb303d94fc8705b38afa6031ed11' 
  AND token = '9aopzM8syLT/RFLQw/QHTY3SIAJO/J1qHzDtHJhXjvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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