SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '979e20c4b4a4487567d103c1d0befacd573dd2e8b5a91a3ce70cdf88297890d3' 
  AND token = 'o6hsWXrAqveYzIZepx8tnkEMBO4aIlRL4P6HnXgRmVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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