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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '339b9d3fb0cacd676f7e93fe29b8f90b42d84b75f043d6d41a0c6c876ead6ddc' 
  AND token = 'dy149oqtS6x8FntUO07yWO3bD52LiTa92NdjwXqdzPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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