SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fea416f1a03b332087d4be7ffbe3005ebe1b0024e064f298b2f6c95a34e98958' 
  AND token = 'NwVG/vPwUKihENP6TbYFVHr+rZGgkUUuigz3JaAeUu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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