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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03df9a06d458e750755c0401b434b3cd177c111ef7db4aca63918c0d3017d3c7' 
  AND token = 'TFpN5X6jwpcNMxsiub3hnI1b4EF9saUcxFU2X6D1p2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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