SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abbd67d162ff93602cc88776a6ae3809c56fedecd5bf7441276cb5cd50c619ee' 
  AND token = 'Up0Q/YB/Sup4VcI+SlzgMNXZsKZIG83PzoDwAQtyd70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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