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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cef14dbd1ee563162ebe85ea3deb0d3f11869873af7ff5dac1986643525ea6a' 
  AND token = 'Aq7/wNGvsAM6iqmeb8f/Mqnd6qxdEWMW94v7JxpFNME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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