SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f2c37b5fafcfe07c7694cc6542a34a68d9f48aa2e78bc74077534cbc198511c' 
  AND token = 'xsBZJxKixW8URvfyfPpikqtFj85DIvDl+QDdM8+rm8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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