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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaf22eb15fc7058b03deadb6662d0e098675384eef33769e5c7b2d82996824be' 
  AND token = 'haerOlMMG9/clwShO2B1ktdKB9DjFi4DxLIMhcTTR9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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