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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf2f87cadcc8e086a77c55ac3769e9ac92e8fb2f8f0dae684e3a23c3490657dc' 
  AND token = 'NhifUKEwUF4OL6k/c9Ugeq9tJ4WMFZgVkDWUwJhyhIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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