SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '870cc631ea5cd2daf88761c3bcaf8373630b6ef43e104850c664715b9faa929e' 
  AND token = 'IHFZR+IJs3uZFcDlvxaNeFaSWgfVgKGWOK3zFVS5TZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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