SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a28636ca9993bd9f89287fa0f9bf4d4d6a1e2d216dc8f73cbdab055184d9c8e' 
  AND token = '/IBKZYIFDzCbzvtf2j+xdp/Hp7I2fSqFC4qb/i4iqug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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