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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86817cdd4f4dcc4d04a98c032b9046fd00400f97d8b23aa3180a2ad4622cc908' 
  AND token = 'mlk/G6EBw2piguTpLQXdvypxrYdiyVP2yzQMwuo0YBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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