SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c428ef724d7d4718cf1c9779d6bf40a36a850919f19331ac9d836c3f0145c896' 
  AND token = 'MzWC2CBGCgjroJYr/0a+cgXtSgGlFWAuk86iMqwWho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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