SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '367d0a2336248b107cced40d19306d0a232139f9d0abb4fd051b2fc3f8f9064a' 
  AND token = 'maMdYVzglBwSCVyavcmQnJXciDnTt8v5ht8m0P+25Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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