SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb541bba1369616f597fbaaf92b4f0eac7f702d46cbe8afa7c269aad8b680d64' 
  AND token = 'nUFP1jf1xp2tbfHU/kVtZ5TLvWWBAYY3JQJNCpG02mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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