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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79bfe799a81c1f3d8408db28bf64602c042bac8a9d21c183cbc5daf3be68e675' 
  AND token = 'rBAaGzV8Z+DX6xkJadOI34UWSUT0t9dt97LmyFfz2RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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