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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b724ae6b077694f4a7ad0163a3274316df3ce7a99a56801766daae3a95155b6' 
  AND token = 'ZrPdjwrba5kE/pOElI/fp7MSKST8BjBoM4wkautWKzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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