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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e6cfbfd514bb17d283ed69e218ddcfc39051d87c1075084bb1c420ad7853e4d' 
  AND token = 'kliGOzyIXtzhNjVFmab7wysWHbz5eVbnHkxJCS/fMl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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