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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbfc86bce0e8ecd73daeafe75df88cd35917876c5acc03f722975d8eff3b0c27' 
  AND token = 'kkNT0HiE6IXSmYeO1g8Ni9c7FVGV/QT35gopDUhi8VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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