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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c4771d63576adb8d05120aef89d8fdad7b667c03808f6d24a82666f163df0fa' 
  AND token = 'FG/vGUyLiQesjAYqrnK5EFbkxcbCqrMn76a8QIvcJK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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