SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ba268022436d069fff2362284a64c09a7e81c92c1cc39f934f7266559745d53' 
  AND token = 'D18MCt+bB8KFIjcZVlPfyEoFMYZvjb6BabH2Smb90oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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