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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c14763a67a555e2600af01e0972e2561822d7d987900b1495e6df5e2480df00f' 
  AND token = 'oN+0PMl/KzxTd8H5UCx8b/OdR/+NzpWxC+O49xObt9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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