SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85699db3cea103e86f66dbca5724a84824b3216096837498c6a464ee32dc042b' 
  AND token = 'N7nzvRgSBNV0LCgYXHbvaqqE+p/8W3qFNJQQQ0jhGms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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