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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f47af8316d388fcd8d20c2b8db4da3a9313a249d4d1d74fc9c09a6fe800a195' 
  AND token = 'iRyHGs8YyMNURMwKiLuT05/v9f5dDAqAb0C6Fhr/g0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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