SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99204ab12ba37a44c7b280adaff71391854189ea36b2262505d3029a058f9f1c' 
  AND token = 'VoMUOS1FJO4GJDkilhJrVVCX+CiKSMLC5XkxvVcjFU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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