SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5056505644531522c5e8b4322556128e56a1b7931e0bb1343c2793abf4c9c39f' 
  AND token = 'zXGWgL61kAXIV9poZvoD/Lo9IJ/wd3X1Pv/1BE9uP2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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