SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e8df1a08c65b78825338e8b7026b43c91c456dc91f67bc265d2ce4c48e1e0ab' 
  AND token = 'gc/ZcKWJTP+D4F/9LnkUJBvWjJO7c3+lji426edFI0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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