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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b22e6ff8991aaf96b1b428f6c353319c6e0ee794a6e40c50a437b5d872e9fdea' 
  AND token = 'oAP6nDmIHaqLY1hIwjKct9LteEmAwKBfEK7caWs3mpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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