SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef8d46178e8b32d1e3c09d7fef65a673ac924aaffde94d67686f382ea459928e' 
  AND token = '+jHlwtncvm2CzyKNQBpO2/Az2WxUpFvlRcL3PMERAiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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