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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6480af45abe350885f09831b95443f920a8178e013b64253a28f105b6ee5da4' 
  AND token = 'Q9d2YK4yw72Damh4R9qZxTVoedM/wVZ0sXaJYidutR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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