SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62bbbb827386f0a4812546afff36d8fb1257c9259c8add2d028761b75a8c5347' 
  AND token = '22UtGub4PMgM4+qX6cIvm4y/unujpSWVVKoXAbEs/3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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