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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65803ec5bfe1d971ab09326d1893fc1a488a2e5552acb1026b4a37667eb888fe' 
  AND token = '7ly0mtzURNrTcZjmT9sobhtn9Xe1hfGX6hlI3XaIWpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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