SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd01099c4c298f515e8398e58e016dd2f5d6598f322bf5ed7e9c40476f775b8db' 
  AND token = '+5xSm56ztjfsFgFPP4fuv6XriWemDK8c2aIZRbnqO/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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