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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3650f638830fbcd632aad3f4453e5d01b81832fa9b90a99f4625e202871220d2' 
  AND token = 'aN91fHOl6s+lpDp67Q+3NnchbNd8qVrpph8fzytGWwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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