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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '110a6646f37c626e7ae3d93d8ae77e0929f32b2dd88670d92e051ba99a2bd19a' 
  AND token = 'QXmdRGVIoBn2kYVJRPP9BunVNv6/iwcMb0i8H5VDHs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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