SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b56c60f644bb381920aaaf2cad16b64f7bd112955e439beb49ed2d112c68239d' 
  AND token = 'jO6CGHpH/nqwY/M/+goy2mv+/EfX+tkuJf9pwzmym8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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