SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9586ab1c438b58b6e684e3a3d5cc7a6605b17e30d7700e9d2078ae54d0b1d959' 
  AND token = '5G6CBhDihQgUekU7KrZNFwkWTSukbYx9/pUFnjqXrYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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