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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a4c90b397e55bc23e92640c997367ae9a706aa4f896e90f536d6a4bb32290b4' 
  AND token = 'QUi6D7lGuGniC3FdHV66SSXy8gcZ3rd1wNS2xSaSTbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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