SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b031f043fcf2083811eb727ee9c7348e89adbe3273842bc99630d80dbbc1946e' 
  AND token = 'y5mtZLKtz8/LQnoJZlbkRsf0oLB49a+w+5Tj1lOOggo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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